JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Submit button will not appear at the bottom if everything is entered correctly. You need to manually add submit button to your form. When you create new form and when you add first field to the form, submit button will be automatically added as well.
I have inspected your form and you already have submit button, so you do not need to add another one.
Feel free to contact us if you have any other questions.